ASTM C78/C78M-10e1
(Test Method)Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)
Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)
SIGNIFICANCE AND USE
3.1 This test method is used to determine the flexural strength of specimens prepared and cured in accordance with Test Methods C42/C42M or Practices C31/C31M or C192/C192M. Results are calculated and reported as the modulus of rupture. The strength determined will vary where there are differences in specimen size, preparation, moisture condition, curing, or where the beam has been molded or sawed to size.
3.2 The results of this test method may be used to determine compliance with specifications or as a basis for proportioning, mixing and placement operations. It is used in testing concrete for the construction of slabs and pavements.
SCOPE
1.1 This test method covers the determination of the flexural strength of concrete by the use of a simple beam with third-point loading.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: C78/C78M − 10
StandardTest Method for
Flexural Strength of Concrete (Using Simple Beam with
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Third-Point Loading)
This standard is issued under the fixed designation C78/C78M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
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ε NOTE—Corrected 9.1.5 editorially in February 2013.
1. Scope* 3. Significance and Use
1.1 Thistestmethodcoversthedeterminationoftheflexural 3.1 This test method is used to determine the flexural
strength of concrete by the use of a simple beam with strength of specimens prepared and cured in accordance with
third-point loading. Test Methods C42/C42M or Practices C31/C31M or C192/
C192M. Results are calculated and reported as the modulus of
1.2 The values stated in either SI units or inch-pound units
rupture. The strength determined will vary where there are
are to be regarded separately as standard. The values stated in
differences in specimen size, preparation, moisture condition,
each system may not be exact equivalents; therefore, each
curing, or where the beam has been molded or sawed to size.
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance 3.2 The results of this test method may be used to determine
with the standard. compliance with specifications or as a basis for proportioning,
mixing and placement operations. It is used in testing concrete
1.3 This standard does not purport to address all of the
for the construction of slabs and pavements.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Apparatus
priate safety and health practices and determine the applica-
4.1 The testing machine shall conform to the requirements
bility of regulatory limitations prior to use.
of the sections on Basis of Verification, Corrections, and Time
Interval Between Verifications of Practices E4. Hand operated
2. Referenced Documents
testing machines having pumps that do not provide a continu-
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2.1 ASTM Standards:
ous loading in one stroke are not permitted. Motorized pumps
C31/C31M Practice for Making and Curing Concrete Test
or hand operated positive displacement pumps having suffi-
Specimens in the Field
cient volume in one continuous stroke to complete a test
C42/C42M Test Method for Obtaining and Testing Drilled
without requiring replenishment are permitted and shall be
Cores and Sawed Beams of Concrete
capable of applying loads at a uniform rate without shock or
C192/C192M Practice for Making and Curing Concrete Test
interruption.
Specimens in the Laboratory
4.2 Loading Apparatus—The third point loading method
C617 Practice for Capping Cylindrical Concrete Specimens
shall be used in making flexure tests of concrete employing
C1077 Practice forAgencies Testing Concrete and Concrete
bearing blocks that will ensure that forces applied to the beam
Aggregates for Use in Construction and Criteria for
will be perpendicular to the face of the specimen and applied
Testing Agency Evaluation
without eccentricity. A diagram of an apparatus that accom-
E4 Practices for Force Verification of Testing Machines
plishes this purpose is shown in Fig. 1.
4.2.1 Allapparatusformakingflexuretestsofconcreteshall
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This test method is under the jurisdiction of ASTM Committee C09 on
be capable of maintaining the specified span length and
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
distances between load-applying blocks and support blocks
C09.61 on Testing for Strength.
constant within 61.0 mm [60.05 in.].
Current edition approved Aug. 1, 2010. Published September 2010. Originally
4.2.2 The ratio of the horizontal distance between the point
approved in 1930. Last previous edition approved in 2009 as C78 – 09. DOI:
10.1520/C0078_C0078M-10E01.
of application of the load and the point of application of the
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
nearest reaction to the depth of the beam shall be 1.0 6 0.03.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.2.3 If an apparatus similar to that illustrated in Fig. 1 is
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. used: the load-applying and support blocks shall not be more
*A Summary of Changes section appears at the end of this standard
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